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From Harsh J <ha...@cloudera.com>
Subject Re: use setrep change number of file replicas,but not work
Date Thu, 10 Apr 2014 02:50:43 GMT
The replica deletion is asynchronous. You can track its deletions via
the NameNode's over-replicated blocks and the pending delete metrics.

On Thu, Apr 10, 2014 at 7:16 AM, ch huang <justlooks@gmail.com> wrote:
> hi,maillist:
>             i try modify replica number on some dir but it seems not work
> ,anyone know why?
>
> # sudo -u hdfs hadoop fs -setrep -R 2 /user/hive/warehouse/mytest
> Replication 2 set:
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000
>
> the file still store 3 replica ,but the echo number changed
> # hadoop fs -ls /user/hive/warehouse/mytest/dsp_request/2014-01-26
> Found 1 items
> -rw-r--r--   2 hdfs hdfs      17660 2014-01-26 18:34
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000
>
> # sudo -u hdfs hdfs fsck
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000 -files -blocks
> -locations
> Connecting to namenode via http://ch11:50070
> FSCK started by hdfs (auth:SIMPLE) from /192.168.11.12 for path
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000 at Thu Apr 10
> 09:39:51 CST 2014
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000 17660 bytes, 1
> block(s):  OK
> 0.
> BP-1043055049-192.168.11.11-1382442676609:blk_-9219869107960013037_1976591
> len=17660 repl=3 [192.168.11.13:50010, 192.168.11.10:50010,
> 192.168.11.14:50010]
>
> i remove the file ,and upload new file ,as i understand ,the new file should
> be stored in 2 replica,but it still store 3 replica ,why?
> # sudo -u hdfs hadoop fs -rm -r -skipTrash
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/*
> Deleted /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000
> # hadoop fs -put ./data_00000
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/
> [root@ch12 ~]# hadoop fs -ls
> /user/hive/warehouse/mytest/dsp_request/2014-01-26
> Found 1 items
> -rw-r--r--   3 root hdfs      17660 2014-04-10 09:40
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000
> # sudo -u hdfs hdfs fsck
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000 -files -blocks
> -locations
> Connecting to namenode via http://ch11:50070
> FSCK started by hdfs (auth:SIMPLE) from /192.168.11.12 for path
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000 at Thu Apr 10
> 09:41:12 CST 2014
> /user/hive/warehouse/mytest/dsp_request/2014-01-26/data_00000 17660 bytes, 1
> block(s):  OK
> 0. BP-1043055049-192.168.11.11-1382442676609:blk_6517693524032437780_8889786
> len=17660 repl=3 [192.168.11.12:50010, 192.168.11.15:50010,
> 192.168.11.13:50010]



-- 
Harsh J

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